Below are the prices and the cancellation charges quoted by my hotel for satake when I went for lunch early this month(Aug 2018).
Restaurant: Sushi Satake
Course: 12,960JPY per person course only
Cancellation policy: 100% of te course if you cancel the reservation on the reservation day.
Below are the prices quoted by my hotel for uomasa Unagi when I went early this month.
Domestic Farmed Unagi / Deluxe Unaju (Unaju: grilled eel over a bed of rice): 4,815JPY
Domestic Farmed Unagi / Superior Unaju: 5,880JPY
Bando Taro Unagi / Deluxe Unaju: 5,830JPY
Bando Taro Unagi / Superior Unaju: 6,880JPY
Natural Unagi / Unaju: market price on tat day (between 12,000 and 30,000JPY)